Electronics isn’t just a hobby that can be used for good, y’know. With just a couple of easily obtainable parts, basic tools, and rudimentary soldering skills it’s possible to really annoy people.
Take those irritating electronic Christmas musical modules, for example. Replace the push-switch with a vibration switch, and it will be activated by the slightest movement.
- Electronic music box from greetings-card/novelty
- Vibration sensor (really cheap one from eBay or Amazon marketplace)
Music box and cheap vibration sensor
Pry apart the music box exposing the internals – taking note where the switch is located.
Solder the vibration switch in place of the push switch (best to remove the battery before doing this)
Re-assemble the music box (I had to cut-away part of the push switch to get it back together)
Deploy the device in a place that will be set off by occasional movement. I taped mine to the bottom of a dining chair in the staff kitchen. This turned out to be a bad idea, as it went off so often that once my colleagues had worked out where it was hidden (took them long enough, mind) they took their annoyance out on it.
I recovered most of the bits after it had been smash and thrown across the room.